Filter screen device and air conditioner indoor unit

Abstract

This disclosure relates to a filter device and an indoor unit of an air conditioner. The filter device is used in an indoor unit of an air conditioner that can switch between return air mode and air supply mode. The filter device includes a filter support, a flexible filter assembly, and a drive device. The filter support provides installation support and displacement guidance. The flexible filter assembly is mounted on the filter support and includes a flexible filter with tensile properties, on which multiple variable-area grid cells are distributed. The drive device is mounted on the filter support and is drively connected to the flexible filter assembly. The drive device is configured to drive the flexible filter assembly to operate according to the air conditioner's operating mode, such that the individual area of ​​each grid cell remains a preset small area in the return air mode and switches to a preset large area in the air supply mode, where the preset large area is larger than the preset small area.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning with a filter device, and more particularly to a filter device and an indoor air conditioning unit. Background Technology

[0002] In air conditioning indoor units with switchable air supply and return vents, the filter, as a core component for air purification and airflow, directly impacts the overall performance of the air conditioner. Currently, most air conditioners of this type use a fixed filter structure with a fixed, non-adjustable mesh area, making it difficult to simultaneously meet the dual requirements of filtration efficiency and air resistance control in both return and supply air modes. In return air mode, to effectively intercept dust particles, the filter needs a smaller unit mesh area, but this significantly increases airflow resistance, reduces intake efficiency, and may even lead to increased energy consumption and operating noise. In supply air mode, while a larger mesh area reduces air resistance and improves air delivery efficiency, it reduces filtration precision, causing uninterrupted pollutants to diffuse into the room, affecting air cleanliness and user experience.

[0003] In existing technologies, air conditioners consistently face a technical dilemma where filtration efficiency and air resistance are mutually constrained when switching between return and supply air modes, making it difficult to achieve optimal performance under different operating conditions. This structural defect not only limits the technological upgrade of indoor units capable of switching between return and supply air, but also fails to meet users' dual demands for efficient filtration and smooth airflow. Therefore, there is an urgent need to develop a filter device that is simple in structure, responds quickly, and is highly adaptable to solve the aforementioned technical problems. Summary of the Invention

[0004] This disclosure provides a filter device and an indoor air conditioner unit to solve the technical dilemma in the prior art where air conditioners always face the mutual constraint between filtration efficiency and air resistance when switching between return air and air supply modes, making it difficult to achieve optimal performance under different operating conditions.

[0005] This disclosure provides a filter device, which includes: Filter screen holders are used to provide installation support and displacement guidance; An elastic filter assembly is assembled on the filter support. The elastic filter assembly includes an elastic filter with tensile properties, and multiple grid cells with variable area are distributed on the elastic filter. A drive unit is mounted on the filter support and is connected in a driving connection to the elastic filter assembly; The drive device is configured to drive the elastic filter assembly to operate according to the air conditioner's operating mode, so that the individual area of ​​the mesh unit remains a preset small area in the return air mode and switches to a preset large area in the air outlet mode, and the preset large area is larger than the preset small area.

[0006] The filter support has a vent, a slot, and a slide. The vent corresponds to the air outlet of the indoor unit of the air conditioner. The slot is used to fix the fixed end of the elastic filter assembly, and the slide provides displacement guidance for the movable end of the elastic filter assembly.

[0007] The elastic filter assembly further includes a rigid filter holder, the edge of the elastic filter is connected to the filter holder, and the filter holder is provided with a slider and a locking block; The locking block engages with the slot of the filter support to maintain a relatively fixed installation state, and the slider engages with the groove of the filter support to achieve a displaceable connection.

[0008] Within the elastic deformation limit of the elastic filter, when the driving device drives the slider to move away from the center of the elastic filter along the groove, the elastic filter undergoes tensile deformation, thereby increasing the individual area of ​​the mesh unit. When the driving device drives the slider to move along the groove towards the center of the elastic filter, the elastic filter springs back to its original position, thereby reducing the individual area of ​​the mesh unit.

[0009] The driving device is either a magnetic suction device or a motor. The driving device is connected to the filter screen fixing frame through a transmission structure and is used to control the filter screen fixing frame to move back and forth along the slide groove.

[0010] When the driving device is a motor, the transmission structure adopts any one of the following: a gear and rack transmission structure, a lead screw and nut transmission structure, or a crank and slider transmission structure. When a rack and pinion drive structure is used, the rack and pinion drive structure includes a gear and a rack. The output shaft of the motor is fixedly connected to the gear. The rack, which meshes with the gear, is integrated on the filter screen holder. When the motor rotates forward, the gear drives the rack to move along the slide groove in the direction of stretching the elastic filter screen, so as to increase the individual area of ​​the mesh unit. When the motor rotates in reverse, the rack moves in the opposite direction, and the elastic filter screen rebounds, so as to decrease the individual area of ​​the mesh unit. When a lead screw and nut transmission structure is used, the lead screw and nut transmission structure includes: a lead screw and a nut, the output shaft of the motor is coaxially and fixedly connected to the lead screw, and the nut is sleeved on the lead screw and rigidly connected to the filter screen fixing frame; when the motor rotates forward, the lead screw drives the nut to move along the axial direction of the lead screw, pulling the filter screen fixing frame to stretch the elastic filter screen; when the motor rotates in reverse, the nut moves in the opposite direction, and the elastic filter screen returns to its original position under its own elastic force. When a crank-slider transmission structure is used, the crank-slider transmission structure includes a crank and a connecting rod. The output shaft of the motor is fixedly connected to the crank. One end of the connecting rod is hinged to the eccentric point of the crank, and the other end of the connecting rod is hinged to the slider of the filter screen fixing frame. When the motor rotates, the crank converts the rotational motion into the linear reciprocating motion of the slider along the slide groove through the connecting rod, thereby completing the stretching and resetting of the elastic filter screen.

[0011] When the driving device is a magnetic attraction device, the transmission structure adopts any one of a magnetic adsorption block, a linkage-type magnetic attraction transmission structure, or an elastic linkage transmission structure. When the transmission structure uses a magnetic adsorption block, the magnetic adsorption device is fixedly connected to one end of the filter screen bracket, and the magnetic adsorption block is installed on the filter screen mounting bracket. When the magnetic adsorption device is powered on, it generates an attractive force to directly adsorb the magnetic adsorption block, thereby driving the filter screen mounting bracket to move along the slide groove in the direction of stretching the elastic filter screen, thereby increasing the individual area of ​​the mesh unit. When the magnetic adsorption device is powered off, the attractive force disappears, and the elastic filter screen rebounds under its own elastic force, thereby driving the filter screen mounting bracket to reset. When the transmission structure adopts a linkage-type magnetic attraction transmission structure, the linkage-type magnetic attraction transmission structure includes a linkage, and the magnetic attraction device includes two symmetrically arranged electromagnets. The magnetic attraction device is hinged to the slider of the filter screen fixing frame through the linkage. When energized, the two electromagnets generate an attraction force and move closer to each other, pulling the slider along the slide groove through the linkage to stretch the elastic filter screen. When de-energized, the attraction force of the two electromagnets disappears, and the linkage pushes the slider back to its original position under the elastic force of the elastic filter screen. When the transmission structure adopts an elastic linkage transmission structure, the elastic linkage transmission structure includes a linkage with a spring. The driving device is connected to the filter screen fixing frame through the spring-loaded linkage. When the driving device is activated, the linkage stretches the spring and pulls the filter screen fixing frame to move, thereby stretching the elastic filter screen. When the driving device is de-energized or demagnetized, the spring's rebound force and the elastic force of the elastic filter screen work together to push the filter screen fixing frame to reset.

[0012] The substrate of the elastic filter is an electrostrictive material, and the electrostrictive material is electrically connected to the voltage control module of the air conditioner indoor unit. The voltage control module is configured to apply a low voltage to the electrostrictive material in the return air mode, causing the elastic filter to be in a contracted state, thereby keeping the mesh unit in a preset small area; and to apply a high voltage in the outlet air mode, causing the elastic filter to be in an extended state, thereby switching the mesh unit to a preset large area.

[0013] The slider and the groove are engaged in either a snap-fit ​​or a magnetic attraction, and the block and the groove are engaged in either a snap-fit ​​or a magnetic attraction. The slots and the slides are evenly distributed along the circumference of the filter support, and the slots and the slides are arranged in a one-to-one correspondence.

[0014] This disclosure also provides an indoor air conditioning unit, including the aforementioned filter device.

[0015] The technical solutions provided in this disclosure have the following advantages compared with the prior art: The filter device and air conditioner indoor unit provided in this disclosure, through the synergistic effect of the drive device and the elastic filter assembly, can automatically adjust the individual area of ​​the grid unit according to the air conditioner's operating mode, precisely matching the different needs of return air and air supply modes. In return air mode, the grid unit maintains a preset small area, which can effectively intercept dust, particulate matter, and other impurities in the air, significantly improving filtration efficiency and ensuring indoor air cleanliness. In air supply mode, the grid unit switches to a preset large area, effectively reducing airflow resistance, lowering duct energy consumption, and simultaneously improving air supply efficiency, ensuring smooth air delivery. This completely solves the technical contradiction that existing fixed filters cannot simultaneously achieve filtration accuracy and air resistance control, achieving optimal performance in both operating modes. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a schematic diagram of the overall structure of the filter device provided in the embodiments of this disclosure; Figure 2 This is an exploded structural diagram of the filter device provided in the embodiments of this disclosure; Figure 3 This is a schematic diagram of the main structure of the filter device provided in the embodiments of this disclosure; Figure 4 A top view of the filter support in the filter device provided in the embodiments of this disclosure; Figure 5 This is a schematic diagram of the installation structure of the slider and locking block on the filter screen fixing frame in the filter screen device provided in the embodiments of this disclosure; Figure 6 Schematic diagram of the installation structure of the crank-slider transmission structure in the filter device provided in the embodiments of this disclosure Figure 1 ; Figure 7 Schematic diagram of the installation structure of the crank-slider transmission structure in the filter device provided in the embodiments of this disclosure Figure 2 ; Figure 8 This is a schematic diagram of the installation structure of the gear and rack transmission structure in the filter device provided in the embodiments of this disclosure.

[0020] Explanation of reference numerals in the attached figures: 1. Filter screen support; 11. Vent; 12. Slot; 13. Slide groove; 2. Elastic filter screen assembly; 21. Elastic filter screen; 211. Mesh unit; 22. Filter screen fixing bracket; 221. Slider; 222. Locking block; 3. Drive device; 31. Motor; 41. Gear and rack transmission structure; 411. Gear; 412. Rack; 42. Crank and slider transmission structure; 421. Crank; 422. Connecting rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0022] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0023] For ease of description, spatial relative terms may be used in this text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptions used in this text have been explained accordingly.

[0024] refer to Figures 1-8 This disclosure provides a filter device, which includes: Filter support bracket 1 is used to provide installation support and displacement guidance; The elastic filter assembly 2 is assembled on the filter support 1. The elastic filter assembly 2 includes an elastic filter 21 with tensile properties, and multiple grid units 211 with variable area are distributed on the elastic filter 21. The drive unit 3 is installed on the filter support 1 and is connected to the elastic filter assembly 2 in a transmission manner; The drive unit 3 is configured to drive the elastic filter assembly 2 to operate according to the air conditioner's operating mode, so that the individual area of ​​the mesh unit 211 remains a preset small area in the return air mode and switches to a preset large area in the air outlet mode, with the preset large area being larger than the preset small area.

[0025] The filter support 1 provides stable installation support and precise displacement guidance for the elastic filter assembly 2 and the drive device 3, ensuring compact assembly and coordinated operation of all components. The elastic filter 21 has excellent tensile properties, and its distributed variable area grid units 211 can flexibly deform under the action of the drive device 3. The deformation process is reversible, and the grid area can be switched without a complex mechanical transmission structure. The drive device 3 is directly connected to the elastic filter assembly 2, enabling rapid response to the air conditioning operation mode signal, driving the elastic filter assembly 2 to move precisely, and achieving timely switching of the grid area, avoiding problems such as filter failure or sudden changes in air resistance during mode switching. This structure has a simple overall design, few parts, and is easy to assemble. It can be adapted to various existing air conditioning indoor units with switchable air outlets and return air inlets without requiring major modifications to the original air conditioning structure, making it widely applicable.

[0026] Specifically, in return air mode, the small-area mesh unit 211 ensures efficient filtration, reducing the adhesion of air pollutants to internal components of the air conditioner, decreasing maintenance frequency and wear, and extending the air conditioner's lifespan. In outlet air mode, the large-area mesh unit 211 reduces air resistance, resulting in more efficient airflow and lower energy consumption. It also reduces noise from turbulent airflow in the duct, improving user comfort. Furthermore, the automatic switching of mesh area requires no manual intervention from the user, making operation convenient.

[0027] In this way, through the coordinated action of the drive device 3 and the elastic filter assembly 2, the individual area of ​​the grid unit 211 can be automatically adjusted according to the air conditioning operation mode, precisely matching the different needs of return air and air supply modes. In return air mode, the grid unit 211 maintains a preset small area, which can effectively intercept dust, particulate matter and other impurities in the air, significantly improving filtration efficiency and ensuring indoor air cleanliness. In air supply mode, the grid unit 211 switches to a preset large area, effectively reducing airflow resistance, reducing duct energy consumption, and improving air supply efficiency to ensure smooth air delivery. This completely solves the technical contradiction that existing fixed filters cannot balance filtration accuracy and air resistance control, achieving optimal performance in both operation modes.

[0028] In some embodiments, the filter support 1 is provided with a vent 11, a slot 12 and a slide 13. The vent 11 corresponds to the air outlet position of the indoor unit of the air conditioner. The slot 12 is used to fix the fixed end of the elastic filter assembly 2, and the slide 13 is used to provide displacement guidance for the movable end of the elastic filter assembly 2.

[0029] For example, the location and size of the vent 11 are determined according to the actual layout of the air outlet of the indoor unit of the air conditioner, so as to ensure that the airflow can fully contact the elastic filter assembly 2 through the vent 11 and ensure the airflow efficiency.

[0030] For example, the structure of the slot 12 is adapted to the structure of the fixed end of the elastic filter assembly 2, and the fixed end is stably installed by fitting and limiting, so as to prevent the fixed end of the elastic filter assembly 2 from loosening and shifting during operation.

[0031] For example, the extension direction of the slide groove 13 is consistent with the preset displacement direction of the movable end of the elastic filter assembly 2. The length of the slide groove 13 is set according to the maximum displacement stroke required by the movable end of the elastic filter assembly 2. The width of the slide groove 13 is adapted to the matching structure of the movable end of the elastic filter assembly 2, which not only ensures smooth displacement of the movable end, but also avoids shaking and displacement during the displacement process.

[0032] In this way, by setting the vent 11, the slot 12 and the slide 13 on the filter support 1, the vent 11 is precisely matched with the air outlet position of the air conditioner indoor unit to ensure airflow. The slot 12 realizes the stable limit of the fixed end of the elastic filter assembly 2, and the slide 13 provides a directional displacement path for the movable end of the elastic filter assembly 2. The three work together to provide basic support for the installation and operation of the elastic filter assembly 2, and ensure that the drive device 3 can drive the movable end of the elastic filter assembly 2 to move along the preset direction, thereby realizing the precise adjustment of the area of ​​the grid unit 211.

[0033] Furthermore, the vent 11 on the filter support 1 ensures the smoothness of the air conditioning outlet channel, the slot 12 fixes the fixed end of the elastic filter assembly 2 to improve the stability of the structural assembly, and the slide 13 provides directional displacement guidance for the movable end of the elastic filter assembly 2 to ensure the accuracy and reliability of the elastic filter assembly 2's movement, effectively avoiding the failure of mesh area adjustment caused by displacement deviation. At the same time, the reasonable layout of the three components makes the overall structure of the filter device compact and easy to assemble, and can stably adapt to the switching requirements of air conditioning return air and air outlet modes, taking into account both filtration efficiency and wind resistance control effect.

[0034] In some embodiments, the elastic filter assembly 2 further includes a rigid filter holder 22, the edge of the elastic filter 21 is connected to the filter holder 22, and the filter holder 22 is provided with a slider 221 and a locking block 222. The locking block 222 engages with the locking groove 12 of the filter support 1 to maintain a relatively fixed installation state, and the slider 221 engages with the sliding groove 13 of the filter support 1 to achieve a displaceable connection.

[0035] For example, the rigid material of the filter holder 22 can be metal or engineering plastic with strength that meets the usage requirements, and its structural shape must be adapted to the edge contour of the elastic filter 21 to ensure that the edge of the elastic filter 21 can be tightly fitted and connected.

[0036] For example, the connection between the edge of the elastic filter 21 and the filter fixing frame 22 can be achieved by fitting or embedding, ensuring that the two do not separate during the stretching or shrinking of the elastic filter 21.

[0037] For example, the structure and size of the card block 222 need to match the card slot 12 of the filter support 1. The fixed end is relatively fixed by fitting and limiting, so as to ensure that the position of the fixed end remains unchanged when the slider 221 slides.

[0038] For example, the shape and size of the slider 221 need to be adapted to the slide groove 13 of the filter support 1, and the fit gap between the slider 221 and the slide groove 13 needs to be controlled within a reasonable range to ensure that the slider 221 slides smoothly along the slide groove 13, and to avoid shaking or deviation during the sliding process, so as to ensure the accuracy of the displacement direction.

[0039] In this way, the rigid filter fixing frame 22 provides a stable installation base for the elastic filter 21. The edge of the elastic filter 21 is connected to the fixing frame to ensure uniform force during deformation. The locking block 222 on the filter fixing frame 22 cooperates with the locking groove 12 of the filter support 1 to achieve relative positioning of the fixed end. At the same time, the slider 221 on the filter fixing frame 22 cooperates with the sliding groove 13 of the filter support 1 to construct a displacement path, so that the driving device 3 can drive the filter fixing frame 22 to move directionally along the sliding groove 13, thereby pulling the elastic filter 21 to stretch or contract within the elastic deformation limit, realizing precise adjustment of the area of ​​the grid unit 211 to adapt to the different needs of the air conditioning return air and air outlet modes.

[0040] Furthermore, the rigid filter holder 22 effectively avoids localized stress concentration during the deformation of the elastic filter 21, extending its service life. The stable connection between the elastic filter 21 and the holder ensures the controllability of the deformation process. The cooperation between the locking block 222 and the locking groove 12 ensures the stability of the elastic filter assembly 2 during installation, preventing loosening and displacement during mode switching. The sliding cooperation between the slider 221 and the sliding groove 13 ensures smooth and accurate displacement of the movable end. The combined effect of these two mechanisms makes the deformation adjustment of the elastic filter 21 precise and reliable. This structural design allows the filter device to maintain a small mesh area in return air mode to ensure filtration efficiency, and switch to a large mesh area in outlet air mode to reduce wind resistance, significantly improving the adaptability and operational stability of the filter device, thereby optimizing the overall performance of the air conditioner.

[0041] In some embodiments, within the elastic deformation limit of the elastic filter 21, when the driving device 3 drives the slider 221 to move away from the center of the elastic filter 21 along the slide groove 13, the elastic filter 21 undergoes tensile deformation, thereby increasing the individual area of ​​the grid cell 211. When the drive device 3 drives the slider 221 to move along the slide groove 13 toward the center of the elastic filter 21, the elastic filter 21 springs back to its original position, thereby reducing the individual area of ​​the grid unit 211.

[0042] For example, the elastic deformation limit refers to the maximum stretching range in which the elastic filter 21 can fully spring back to its original position after being stretched without permanent deformation. This range is determined by the material properties and structural configuration of the elastic filter 21.

[0043] For example, the direction away from the center of the elastic filter 21 means that the displacement direction of the slider 221 is opposite to the center of the elastic filter 21. This direction must be consistent with the extension direction of the groove 13 to ensure that the stretching action can be evenly applied to the elastic filter 21.

[0044] For example, the direction closer to the center of the elastic filter 21 means that the displacement direction of the slider 221 tends to approach the center of the elastic filter 21. This direction is opposite to the displacement direction during stretching, providing a reasonable path for the elastic filter 21 to rebound and reset.

[0045] For example, the springback reset refers to the process by which the elastic filter 21 recovers to its natural state by its own elasticity after losing the tensile force of the driving device 3. This process does not require additional driving force, ensuring that the area of ​​the grid unit 211 can quickly return to the preset small area.

[0046] In this way, based on the stretching and rebound characteristics of the elastic filter 21, within its elastic deformation limit, the driving device 3 drives the slider 221 to move away from the center of the elastic filter 21 along the slide groove 13, thereby achieving the stretching deformation of the elastic filter 21 and increasing the individual area of ​​the grid unit 211; the driving device 3 drives the slider 221 to move closer to the center of the elastic filter 21 along the slide groove 13, and uses the rebound energy of the elastic filter 21 itself to reset it, thereby reducing the individual area of ​​the grid unit 211. This allows the area of ​​the grid unit 211 to be accurately switched according to the air conditioning operation mode, adapting to the different needs of return air and air supply modes.

[0047] Furthermore, the synergistic effect of the drive device 3, slider 221, slide groove 13, and elastic filter 21 makes the adjustment process of the grid unit 211 area controllable and efficient. During stretching deformation, it can quickly switch to a large area grid to reduce airflow resistance, and during rebound reset, it can quickly return to a small area grid to ensure return air filtration efficiency, effectively balancing filtration performance and duct flow efficiency under different operating modes. This adjustment method relies on the inherent characteristics of the elastic filter 21 and simple displacement transmission, resulting in rapid response and reliable operation. It avoids potential malfunctions caused by complex structures, and the adjustment method within the elastic deformation limit protects the elastic filter 21, extends its service life, and further improves the overall operational stability and practicality of the filter device.

[0048] In some embodiments, the drive device 3 is either a magnetic suction device or a motor 31. The drive device 3 is connected to the filter screen fixing frame 22 through a transmission structure and is used to control the filter screen fixing frame 22 to move back and forth along the slide groove 13.

[0049] For example, the magnetic attraction device drives the filter holder 22 to move by generating magnetic force to attract or repel. The magnitude of the magnetic force must meet the requirement of traction elastic filter 21 to undergo a preset deformation, so as to ensure the effective execution of the displacement action.

[0050] For example, the motor 31 can be a stepper motor 31 or a servo motor 31, etc. The rotation of the output shaft is combined with the transmission structure to convert it into the linear reciprocating motion of the filter fixing frame 22. Its speed and torque need to be adapted to the displacement stroke and force requirements of the filter fixing frame 22.

[0051] For example, the transmission structure is an intermediate component connecting the drive device 3 and the filter screen fixing frame 22. Its structure must be compatible with the installation method of the selected drive device 3 and the filter screen fixing frame 22 to ensure the smoothness and stability of power transmission and realize the efficient conversion of driving force into displacement action.

[0052] For example, the directional resetting filter fixing bracket 22 moves back and forth along the extension direction of the slide groove 13. The stroke and direction of the displacement are controlled by the air conditioning operation mode switching signal to ensure that the area of ​​the grid unit 211 can be accurately switched to the corresponding preset size.

[0053] In this way, a magnetic suction device or a motor 31 is selected as the driving device 3. The driving device 3 is connected to the filter screen fixing frame 22 through the transmission structure. The magnetic force of the magnetic suction device or the power output of the motor 31 is used to drive the filter screen fixing frame 22 to move back and forth along the slide groove 13 of the filter screen support 1 in a directional manner. This causes the elastic filter screen 21 to stretch and deform or rebound and reset, thereby accurately controlling the area size of the grid unit 211 and realizing the adaptation and switching with the air conditioner return air and air outlet modes.

[0054] Furthermore, the magnetic suction device or motor 31 possesses reliable driving force output characteristics. Combined with a suitable transmission structure, it provides stable power for the reciprocating movement of the filter holder 22, ensuring the accuracy and timely response of the mesh unit 211 area adjustment. This allows the filter to quickly switch to a small mesh area in return air mode to guarantee filtration efficiency, and rapidly switch to a large mesh area in outlet air mode to reduce wind resistance. Both drive devices 3 have mature structures and stable operation. Their cooperation with the filter holder 22 and slide rail 13 is simple and efficient, reducing the risk of failure caused by complex transmissions. Simultaneously, they are compatible with the existing filter device's structural layout, improving the overall operational reliability and adaptability of the filter device, and further optimizing the comprehensive performance of the air conditioner.

[0055] In some embodiments, when the driving device 3 is a motor 31, the transmission structure adopts any one of the following: a gear and rack transmission structure 4141, a lead screw and nut transmission structure, or a crank and slider transmission structure 42. When the gear and rack transmission structure 4141 is used, the gear and rack transmission structure 4141 includes a gear 411 and a rack 412. The output shaft of the motor 31 is fixedly connected to the gear 411. The rack 412, which meshes with the gear 411, is integrated on the filter screen fixing frame 22. When the motor 31 rotates forward, the gear 411 drives the rack 412 to move along the slide groove 13 in the direction of stretching the elastic filter screen 21, so that the individual area of ​​the grid unit 211 increases. When the motor 31 rotates in reverse, the rack 412 moves in the opposite direction, and the elastic filter screen 21 rebounds, so that the individual area of ​​the grid unit 211 decreases. When a lead screw and nut drive structure is used, the lead screw and nut drive structure includes: a lead screw and a nut. The output shaft of the motor 31 is coaxially and fixedly connected to the lead screw. The nut is sleeved on the lead screw and rigidly connected to the filter screen fixing frame 22. When the motor 31 rotates forward, the lead screw drives the nut to move along the axial direction of the lead screw, pulling the filter screen fixing frame 22 to stretch the elastic filter screen 21. When the motor 31 rotates in reverse, the nut moves in the opposite direction, and the elastic filter screen 21 resets under its own elastic force. When the crank-slider transmission structure 42 is used, the crank-slider transmission structure 42 includes: a crank 421 and a connecting rod 422. The output shaft of the motor 31 is fixedly connected to the crank 421. One end of the connecting rod 422 is hinged to the eccentric point of the crank 421, and the other end of the connecting rod 422 is hinged to the slider 221 of the filter screen fixing frame 22. When the motor 31 rotates, the crank 421 converts the rotational motion into the linear reciprocating motion of the slider 221 along the slide groove 13 through the connecting rod 422, thus completing the stretching and resetting of the elastic filter screen 21.

[0056] For example, in the gear and rack transmission structure 4141, the tooth profile and module of the gear 411 and the rack 412 need to be compatible with each other to ensure smooth meshing transmission. The extension direction of the rack 412 is consistent with the extension direction of the slide groove 13 to ensure that the filter screen fixing frame 22 is displaced along the preset direction.

[0057] For example, in the lead screw and nut transmission structure, the thread parameters of the lead screw and nut are matched, and the clearance between the two is controlled within a reasonable range to ensure the accuracy of transmission. The rigid connection between the nut and the filter screen fixing frame 22 must ensure that the power transmission is lossless so that the filter screen fixing frame 22 can move synchronously with the nut.

[0058] For example, in the crank-slider transmission structure 42, the position of the eccentric point of the crank 421 is set according to the displacement stroke required by the filter screen fixing frame 22, the length of the connecting rod 422 needs to be adapted to the eccentricity of the crank 421 and the displacement range of the slider 221, and the connection at the hinge needs to rotate flexibly to ensure the efficient conversion of rotary motion into linear motion.

[0059] For example, the direction of the motor 31's forward and reverse rotation is controlled by the air conditioning operation mode signal. Forward rotation corresponds to the drive filter fixing frame 22 to move in the direction of stretching the elastic filter 21, and reverse rotation corresponds to the drive filter fixing frame 22 to move in the direction that allows the elastic filter 21 to rebound, ensuring that the area switching of the grid unit 211 and the air conditioning mode switching are accurately synchronized.

[0060] Thus, for the case where the drive device 3 is a motor 31, a gear and rack transmission structure 4141, a lead screw and nut transmission structure, or a crank and slider transmission structure 42 are selected as the appropriate transmission structure. Through the precise connection between the output shaft of the motor 31 and the corresponding transmission structure, the forward and reverse rotation or rotational motion of the motor 31 is converted into the filter fixing frame 22 moving back and forth along the straight line of the slide groove 13, thereby pulling the elastic filter 21 to achieve tensile deformation or springback reset. This allows for precise control of the area size of the mesh unit 211, ensuring efficient adaptation and switching with the air conditioning return and exhaust modes.

[0061] Furthermore, all three transmission structures possess mature and reliable power transmission characteristics, enabling precise control of the displacement of the filter screen holder 22 in conjunction with the motor 31, ensuring the stability and timely response of the mesh unit 211 area adjustment. The gear and rack transmission structure 4141 offers high transmission efficiency and accurate displacement, allowing for rapid switching of mesh area; the screw and nut transmission structure provides smooth transmission and strong load-bearing capacity, offering stable force for the stretching of the elastic filter screen 21; the crank-slider transmission structure 42 is compact and flexible, adapting to the reciprocating movement requirements of the filter screen holder 22. The selection of different transmission structures can accommodate different installation spaces and performance requirements, further expanding the adaptability of the filter device. Simultaneously, the cooperation between each transmission structure, the motor 31, the filter screen holder 22, and the slide 13 is simple and efficient, reducing potential malfunctions and ensuring that the filter device stably performs both filtration efficiency and low wind resistance during long-term use, optimizing the overall air conditioning performance.

[0062] In some embodiments, when the driving device 3 is a magnetic attraction device, the transmission structure adopts any one of the following: magnetic adsorption block, magnetic attraction transmission structure of link 422, or elastic link 422 transmission structure. When the transmission structure uses a magnetic adsorption block, the magnetic adsorption device is fixedly connected to one end of the filter screen bracket 1, and the magnetic adsorption block is set on the filter screen fixing frame 22. When the magnetic adsorption device is powered on, it generates an attractive force to directly adsorb the magnetic adsorption block, thereby driving the filter screen fixing frame 22 to move along the slide groove 13 in the direction of stretching the elastic filter screen 21, so as to increase the individual area of ​​the grid unit 211. When the magnetic adsorption device is de-energized, the attractive force disappears, and the elastic filter screen 21 rebounds under its own elastic force, thereby driving the filter screen fixing frame 22 to reset. When the transmission structure adopts the magnetic attraction transmission structure of the linkage 422, the magnetic attraction transmission structure of the linkage 422 includes the linkage 422, and the magnetic attraction device includes two symmetrically arranged electromagnets. The magnetic attraction device is hinged to the slider 221 of the filter screen fixing frame 22 through the linkage 422. When energized, the two electromagnets generate attraction and move closer to each other, pulling the slider 221 along the slide groove 13 through the linkage 422 to stretch the elastic filter screen 21. When de-energized, the attraction of the two electromagnets disappears, and the linkage 422 pushes the slider 221 to reset under the elastic force of the elastic filter screen 21. When the transmission structure adopts the elastic link 422 transmission structure, the elastic link 422 transmission structure includes a link 422 with a spring. The drive device 3 is connected to the filter screen fixing frame 22 through the spring-loaded link 422. When the drive device 3 is activated, the link 422 stretches the spring and pulls the filter screen fixing frame 22 to move, so as to stretch the elastic filter screen 21. When the drive device 3 is de-energized or demagnetized, the spring's rebound force and the elastic force of the elastic filter screen 21 work together to push the filter screen fixing frame 22 to reset.

[0063] For example, the material of the magnetic adsorption block needs to have good magnetic conductivity, and its installation position corresponds to the position of the magnetic adsorption device to ensure that the magnetic adsorption device can generate sufficient attraction to drive the filter fixing frame 22 to move when it is powered on.

[0064] For example, in the magnetic transmission structure of the connecting rod 422, the length of the connecting rod 422 needs to be adapted to the installation distance between the electromagnet and the slider 221, and the connection at the hinge needs to rotate flexibly to ensure that the pulling force can be efficiently transmitted through the connecting rod 422 when the electromagnet is attracted.

[0065] For example, the spring in the transmission structure of the elastic link 422 needs to have a suitable elastic coefficient, and its elastic force is matched with the elastic force of the elastic filter 21 to ensure that the filter fixing frame 22 can be pushed smoothly to reset when the drive device 3 loses its magnetism.

[0066] For example, the power-on and power-off states of the magnetic suction device are controlled by the air conditioner operation mode signal. Power-on corresponds to driving the filter fixing frame 22 to move in the direction of stretching the elastic filter 21, and power-off corresponds to allowing the elastic filter 21 to spring back and reset, ensuring that the area switching of the grid unit 211 and the air conditioner mode switching are accurately synchronized.

[0067] Thus, for the case where the drive device 3 is a magnetic suction device, a magnetic suction block, a magnetic suction transmission structure of link 422, or an elastic link 422 transmission structure are selected as the appropriate transmission structure. By utilizing the magnetic suction device's characteristics of generating magnetism when energized and losing magnetism when de-energized, and in conjunction with the corresponding transmission structure, the force is transmitted to drive the filter fixing frame 22 to move and reset along the slide groove 13. This, in turn, pulls the elastic filter 21 to undergo tensile deformation or rebounds due to its own elasticity, precisely controlling the area size of the grid unit 211, and achieving adaptation and switching with the air conditioner's return air and air outlet modes.

[0068] Furthermore, all three transmission structures are highly compatible with the power characteristics of the magnetic suction device, enabling stable and controllable displacement of the filter fixing bracket 22 and ensuring timely and accurate response to the area adjustment of the grid unit 211. The magnetic adsorption block has a simple structure and direct power transmission, allowing for rapid filter stretching and resetting. The magnetic suction transmission structure of the linkage 422 is driven by the attraction force of symmetrical electromagnets, ensuring balanced force and uniform filter deformation. The elastic linkage 422 transmission structure uses the rebound force of springs to assist in resetting, further improving the smoothness and reliability of the resetting action. The selection of different transmission structures can adapt to different installation scenarios and performance requirements, enriching the compatibility range of the filter device. At the same time, each structure has the advantages of stable operation and low failure risk, ensuring long-term high-efficiency filtration in return air mode and low wind resistance in outlet air mode, continuously optimizing the overall operating performance of the air conditioner.

[0069] In some embodiments, the substrate of the elastic filter 21 is an electrostrictive material, which is electrically connected to the voltage control module of the air conditioner indoor unit. The voltage control module is configured to apply a low voltage to the electrostrictive material in the return air mode, causing the elastic filter 21 to be in a contracted state, thereby keeping the mesh unit 211 in a preset small area; and to apply a high voltage in the outlet air mode, causing the elastic filter 21 to be in an extended state, thereby switching the mesh unit 211 to a preset large area.

[0070] For example, the electrostrictive material is a functional material with voltage response characteristics. Its contraction and expansion amplitude can be precisely controlled by the voltage magnitude. The material selection needs to meet the preset adjustment requirements of the grid unit 211 area when the air conditioner operation mode is switched.

[0071] For example, the low voltage is a voltage value that enables the electrostrictive material to produce a preset amount of contraction. This voltage value needs to be determined according to the material characteristics and the preset small area requirement to ensure that the mesh unit 211 achieves the filtration accuracy required for the return air mode after the elastic filter 21 contracts.

[0072] For example, the high voltage is a voltage value that enables the electrostrictive material to produce a preset amount of extension. This voltage value is higher than the low voltage and needs to match the preset large area requirement to ensure that the mesh unit 211 can effectively reduce the air outlet resistance after the elastic filter 21 is extended.

[0073] For example, the voltage control module is the control component in the indoor unit of the air conditioner responsible for outputting the corresponding voltage. Its electrical connection with the electrostrictive material needs to ensure the stability of voltage transmission. The voltage switching timing is synchronized with the switching of the air conditioner's operating mode to ensure that the area of ​​the grid unit 211 is timely adapted to the mode requirements.

[0074] In this way, an electrostrictive material is used as the base material of the elastic filter 21. The material is electrically connected to the voltage control module of the air conditioner indoor unit. The voltage control module applies low voltage and high voltage to the electrostrictive material according to different air conditioner operating modes. By utilizing the contraction and expansion characteristics of the electrostrictive material under different voltages, the elastic filter 21 is in a contracted or expanded state, thereby precisely controlling the mesh unit 211 to maintain a preset small area or switch to a preset large area, so as to achieve adaptation with the return air and air outlet modes.

[0075] Furthermore, the electrostrictive material possesses characteristics of rapid response and high adjustment precision. Combined with the voltage control module, it achieves active and precise control of the 211 grid unit area, enabling mode switching without complex mechanical transmission structures, thus improving the filter device's response speed and adjustment accuracy. The contracted state under low voltage ensures efficient filtration in the return air mode, while the extended state under high voltage effectively reduces air resistance in the outlet air mode, further optimizing the balance between filtration efficiency and duct performance. This structural design simplifies the transmission links of the filter device, reduces potential malfunctions caused by mechanical wear, enhances operational stability, and is suitable for air conditioning systems with higher performance requirements, broadening the application scenarios of the filter device and improving the overall competitiveness of the air conditioning system.

[0076] In some embodiments, the sliding block 221 and the sliding groove 13 are engaged in either a snap-fit ​​or a magnetic attraction, and the locking block 222 and the locking groove 12 are engaged in either a snap-fit ​​or a magnetic attraction. The slots 12 and the slides 13 are evenly arranged along the circumference of the filter support 1, and the slots 12 and the slides 13 are set in a one-to-one correspondence.

[0077] For example, the snap-fit ​​refers to the connection achieved by the engagement of the protrusion and the groove. The snap-fit ​​between the slider 221 and the slide groove 13 requires that the protrusion on the slider 221 matches the groove in the slide groove 13. The snap-fit ​​between the locking block 222 and the locking groove 12 requires that the structure of the locking block 222 and the shape of the locking groove 12 are precisely matched to ensure a stable connection and not affect the displacement of the slider 221.

[0078] For example, magnetic attraction means that the connection is achieved through magnetic attraction. The magnetic attraction between slider 221 and slide groove 13, and between block 222 and slot 12 requires magnetic components to be set on the corresponding parts, and the magnitude of magnetic attraction must be appropriate to ensure the reliability of the connection and allow slider 221 to smoothly detach from the attraction and move along slide groove 13 under the action of driving force.

[0079] For example, the finger slots 12 and sliding grooves 13 are evenly distributed in a ring around the central axis of the filter support 1 to ensure that the installation and force of each part of the elastic filter assembly 2 are balanced.

[0080] For example, a one-to-one correspondence setting means that each slot 12 has a corresponding slide groove 13 in the circumferential position, so that the card block 222 and the slider 221 on the filter screen fixing frame 22 can accurately match the corresponding slot 12 and slide groove 13 respectively, ensuring assembly accuracy and action coordination.

[0081] In this way, the cooperation method between slider 221 and slide groove 13, and between block 222 and slot 12 is set to either snap-fit ​​cooperation or magnetic attraction cooperation. At the same time, slot 12 and slide groove 13 are evenly distributed and correspond one-to-one along the circumference of filter support 1. The appropriate cooperation method ensures the stability of the connection between elastic filter assembly 2 and filter support 1 and the smoothness of displacement. With the reasonable layout of slot 12 and slide groove 13, the elastic filter 21 is subjected to uniform force. When the drive device 3 drives the filter fixing frame 22 to move, the elastic filter 21 can smoothly undergo tensile deformation or rebound reset, so as to achieve precise adjustment of the area of ​​grid unit 211 to adapt to different air conditioning operation modes.

[0082] Furthermore, both snap-fit ​​and magnetic coupling offer convenient installation and reliable connection, effectively ensuring the smooth movement of the slider 221 along the slide groove 13 and the stability of the locking block 222 within the slot 12. This avoids loosening or jamming during mode switching, improving the operational reliability of the filter device. The slots 12 and slide grooves 13 are evenly distributed and correspond one-to-one along the circumference of the filter support 1, making the force distribution of the elastic filter assembly 2 more balanced, reducing filter damage caused by local stress concentration, and extending service life. At the same time, it ensures the consistency of the area adjustment of the mesh unit 211, allowing the filter to maintain a uniform small-area mesh in return air mode to ensure filtration effect, and forming a uniform large-area mesh in outlet air mode to reduce wind resistance. This further optimizes the balance between filtration efficiency and duct performance, improving the overall operating effect of the air conditioner.

[0083] This disclosure also provides an indoor air conditioning unit, including the aforementioned filter device, which can achieve all the technical effects of the aforementioned filter device, and will not be described in detail here.

[0084] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0085] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0086] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filter device for an indoor air conditioning unit with switchable return air mode and air supply mode, characterized in that, The filter device includes: Filter screen holders are used to provide installation support and displacement guidance; An elastic filter assembly is assembled on the filter support. The elastic filter assembly includes an elastic filter with tensile properties, and multiple grid cells with variable area are distributed on the elastic filter. A drive unit is mounted on the filter support and is connected in a driving connection to the elastic filter assembly; The drive device is configured to drive the elastic filter assembly to operate according to the air conditioner's operating mode, so that the individual area of ​​the mesh unit remains a preset small area in the return air mode and switches to a preset large area in the air outlet mode, and the preset large area is larger than the preset small area.

2. The filter device according to claim 1, characterized in that, The filter support is provided with a vent, a slot and a slide. The vent corresponds to the air outlet position of the indoor unit of the air conditioner. The slot is used to fix the fixed end of the elastic filter assembly, and the slide is used to provide displacement guidance for the movable end of the elastic filter assembly.

3. The filter device according to claim 2, characterized in that, The elastic filter assembly also includes a rigid filter holder, the edge of the elastic filter is connected to the filter holder, and the filter holder is provided with a slider and a locking block; The locking block engages with the slot of the filter support to maintain a relatively fixed installation state, and the slider engages with the groove of the filter support to achieve a displaceable connection.

4. The filter device according to claim 3, characterized in that, Within the elastic deformation limit of the elastic filter, when the driving device drives the slider to move away from the center of the elastic filter along the groove, the elastic filter undergoes tensile deformation, thereby increasing the individual area of ​​the mesh unit; When the driving device drives the slider to move along the groove towards the center of the elastic filter, the elastic filter springs back to its original position, thereby reducing the individual area of ​​the mesh unit.

5. The filter device according to claim 4, characterized in that, The driving device is either a magnetic suction device or a motor. The driving device is connected to the filter screen fixing frame through a transmission structure and is used to control the filter screen fixing frame to move back and forth along the slide groove.

6. The filter device according to claim 5, characterized in that, When the driving device is a motor, the transmission structure adopts any one of the following: a gear and rack transmission structure, a lead screw and nut transmission structure, or a crank and slider transmission structure. When a rack and pinion drive structure is used, the rack and pinion drive structure includes a gear and a rack. The output shaft of the motor is fixedly connected to the gear. The rack, which meshes with the gear, is integrated on the filter screen holder. When the motor rotates forward, the gear drives the rack to move along the slide groove in the direction of stretching the elastic filter screen, so as to increase the individual area of ​​the mesh unit. When the motor rotates in reverse, the rack moves in the opposite direction, and the elastic filter screen rebounds, so as to decrease the individual area of ​​the mesh unit. When a lead screw and nut transmission structure is used, the lead screw and nut transmission structure includes: a lead screw and a nut, the output shaft of the motor is coaxially and fixedly connected to the lead screw, and the nut is sleeved on the lead screw and rigidly connected to the filter screen fixing frame; when the motor rotates forward, the lead screw drives the nut to move along the axial direction of the lead screw, pulling the filter screen fixing frame to stretch the elastic filter screen; when the motor rotates in reverse, the nut moves in the opposite direction, and the elastic filter screen returns to its original position under its own elastic force. When a crank-slider transmission structure is used, the crank-slider transmission structure includes a crank and a connecting rod. The output shaft of the motor is fixedly connected to the crank. One end of the connecting rod is hinged to the eccentric point of the crank, and the other end of the connecting rod is hinged to the slider of the filter screen fixing frame. When the motor rotates, the crank converts the rotational motion into the linear reciprocating motion of the slider along the slide groove through the connecting rod, thereby completing the stretching and resetting of the elastic filter screen.

7. The filter device according to claim 5, characterized in that, When the driving device is a magnetic attraction device, the transmission structure adopts any one of the following: magnetic adsorption block, linkage magnetic attraction transmission structure, or elastic linkage transmission structure. When the transmission structure uses a magnetic adsorption block, the magnetic adsorption device is fixedly connected to one end of the filter screen bracket, and the magnetic adsorption block is installed on the filter screen mounting bracket. When the magnetic adsorption device is powered on, it generates an attractive force to directly adsorb the magnetic adsorption block, thereby driving the filter screen mounting bracket to move along the slide groove in the direction of stretching the elastic filter screen, thereby increasing the individual area of ​​the mesh unit. When the magnetic adsorption device is powered off, the attractive force disappears, and the elastic filter screen rebounds under its own elastic force, thereby driving the filter screen mounting bracket to reset. When the transmission structure adopts a linkage-type magnetic attraction transmission structure, the linkage-type magnetic attraction transmission structure includes a linkage, and the magnetic attraction device includes two symmetrically arranged electromagnets. The magnetic attraction device is hinged to the slider of the filter screen fixing frame through the linkage. When energized, the two electromagnets generate an attraction force and move closer to each other, pulling the slider along the slide groove through the linkage to stretch the elastic filter screen. When de-energized, the attraction force of the two electromagnets disappears, and the linkage pushes the slider back to its original position under the elastic force of the elastic filter screen. When the transmission structure adopts an elastic linkage transmission structure, the elastic linkage transmission structure includes a linkage with a spring. The driving device is connected to the filter screen fixing frame through the spring-loaded linkage. When the driving device is activated, the linkage stretches the spring and pulls the filter screen fixing frame to move, thereby stretching the elastic filter screen. When the driving device is de-energized or demagnetized, the spring's rebound force and the elastic force of the elastic filter screen work together to push the filter screen fixing frame to reset.

8. The filter device according to claim 1, characterized in that, The substrate of the elastic filter is an electrostrictive material, and the electrostrictive material is electrically connected to the voltage control module of the air conditioner indoor unit; The voltage control module is configured to apply a low voltage to the electrostrictive material in the return air mode, causing the elastic filter to be in a contracted state, thereby keeping the mesh unit in a preset small area; and to apply a high voltage in the outlet air mode, causing the elastic filter to be in an extended state, thereby switching the mesh unit to a preset large area.

9. The filter device according to claim 3, characterized in that, The slider and the groove are engaged in one of two ways: a snap-fit ​​or a magnetic attraction. The block and the groove are engaged in one of two ways: a snap-fit ​​or a magnetic attraction. The slots and the slides are evenly distributed along the circumference of the filter support, and the slots and the slides are arranged in a one-to-one correspondence.

10. An indoor unit for an air conditioner, characterized in that, Includes the filter device as described in any one of claims 1-9.

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